<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .chessboard {
            width: 400px;
            background-color: burlywood;
            border: 10px solid darkgray;
        }
        .chessboard div {
            display: flex;
        }
        .chessboard div span {
            width: 100px;
            height: 100px;
        }
        .chessboard div:nth-child(odd) span:nth-child(even),
        .chessboard div:nth-child(even) span:nth-child(odd) {
            background-color: rgba(0,0,0,0.3);
        }
    </style>
</head>
<body>
    <figure class="chessboard">
        <div>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </div>
        <div>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </div>
        <div>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </div>
        <div>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </div>
    </figure>
</body>
</html>